Go failing - expected 'package', found 

问题:

I've been having a hard time trying to execute a simple golang program in a virtual machine powered by vagrant. These are the relevant fields of my go env:

GOARCH="amd64"
GOPATH="/usr/local/src/go"
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"

This is the program I'm trying to execute ( located in /usr/local/src/go/program ):

package program

import (
    "fmt"
)

func main() {
    fmt.Print("Aloha")
}

This, the output that I get:

main.go:4:5:
/usr/local/go/src/fmt/doc.go:1:1: expected 'package', found 'EOF'
package runtime:
/usr/local/go/src/runtime/alg.go:1:1: expected 'package', found 'EOF'

Take into account that this is a completely fake program. The weird thing is that it totally works in a different environment. What am I missing here?

Thanks a lot!

回答1:

Using VS Code for GO, and faced the same issue. Saving the file 'Ctrl+S' on Windows fixed the issue.

Reference : Answered by Nico

回答2:

This usually happens when you have a file e.g. foo_test.go empty or without package declaration.

回答3:

The problem wasn't neither with GOROOT nor GOPATH. The go installation failed at some point, leaving the whole thing unstable ( files created but completely empty ). When provisioning the virtual machine again, the go module checked whether the files existed. As they did, it took by granted that the installation had already take place.

A clean up and fresh installation from scratch solved the problem.

回答4:

Just save the file first and than run the cammand.it is working.

go run main.go

回答5:

For me, this also happened using Atom + Go Plus + Terminal Plus. The problem was that leading bracket was not on the "correct" line.

NOTE: Go Plus warns about syntax upon save, but I had imported this file after creating it locally with VIM, so I was never presented with the lint errors...

Error:

package main
import "fmt"
func main() 
{
    fmt.Println("hello world")
}

Correct:

package main
import "fmt"
func main() {
    fmt.Println("hello world")
}

回答6:

With gopls (v0.4.0 at the time of writing, so pretty unstable!) and vscode doing cmd+shift+P > Go: Restart language server worked for me.

回答7:

As said by already suggested by Nico, When you create a new project and new main.go file this error will appear when the file is not saved. Save the file (ctrl + s) and this error will disappear in both mac & windows. I faced the same issue and just got it resolved by doing ctrl+S on the main.go file.

回答8:

A separate Go file in the same package,didn't have the "package main" declaration and because of this the console was giving errors on running the Main GO file.

On providing the package main declaration to the other Go file ,the error stopped showing.

回答9:

As a new go user I came upon this answer looking for someone to tell me that I need to start my scripts with package main although my error was a little different,

... expected 'package', found 'import'

It's real obvious now, but hey, that's how it goes.